Sawmill-carriage.



N. SHAW.

SAWMILL CARRIAGE.

(No Model.)

(Application med oct. 1e, 189e.)

Patented June 27. |899 4 Sheets-Sheet l.

Fl" l TH: Nunms Pneus co.. Puouumo., wAsNmeroN. n4 c No. 627,539.Patented lune 27, |899. N. SHAW.

SAWMILL CARRIAGE.

(Application filed 0ct 16, 1896.)

4 Sheets-Sheet 2.

(No Model.\

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THE Nonnls Crans on. Puma-uma.. wAsmN-GTON. n. c.

No. 627,539. Patented .lune 2,7, |899. N. SHAW.

SAWMILL CARRIAGE.

(Application filed Oct. 16, 1896.)

4 Sheets-Sheet 3.

" `\g A. g

v- .1 g 4 a l H (No Model.)

.15mg/m A Witn @Sses BY Attorneys.

No. 627,539. Patented lune 27, |899.

N. SHAW.

SAWMILLv CARRIAGE.

(Application led Oct.- 16, 1896.) (No Model.)

4 .Sheets-Sheet 4.

Invento:a

By Attorneys.

NOAlI SHAVMOF EAU CLAIRE, WISCONSIN.

sAwMlLL-CARRIAGE.

sPEcrFrcAfrI'oN forming part ef Letters Patent No. 627,539, dated June27,1899;

" A Application led October 16.l 1896. Serial No. 609,089. (No model.)

Be itknown that I; NOAH SHAW, a citizen of the United States, Yresidingat Eau Claire, in the county of AEau Claire and State `of WVisconsin,have invented a new and useful Sawmill-Carriage,of whichthe following isa specilication. l Y

The invention relates sawmill-carriages. c,

The object of the lpresent .invention is to improve the construction 'ofsawmill car"- riages, more especially the mechanism for offsetting andonsetting the head-blocks, and to provide simple, inexpensive, andefficient offsetting and onsetting mechanism which will be accessiblewithout removing the decking of a carriage and which may be readilyapplied to sawmill-carriages now in use.

A furtherobjectof the invention is to improve the construction forsupporting the setworks insawmill-carriages where the headblocks -areslidingly mounted and are moved transversely of the'carriage inoffsetting and onsettin g a log and to provide a support which toimprovements in will be positivein its movement and reciprocate withthehead-blocks and hold the setshaft in its proper position relative .tothe head-blocks in order to prevent any liability` of the lumbervary'ingin thickness.

Another object of the V invention is to enable the set-shaft to be.readily adj ustedvfto bring itspinions in proper mesh with the racks inorderto enable theseilnprovements toy be applied to differentconstructions of sawmill-carriages andv set-works.

Furthermore, the invention has for its object to reduce the friction ofthe head-blocks to a minimum and to enable them to move readily, evenwhen the chairs, in which the head-blocks are mounted, are subjected tothe greatest pressure, as in the backward or offsetting movement, whichis made ata time when the-forward movement of the carriage is stopped,and a rapid movement, of about two thousand feet per minute, is madebackward for another cut, and the head-blocks and the set-works togetherwith a log resting upon the head-blocks are heavy and exert a heavypressure on the forward side of the head-blocks,'rand'when the rapidmovement backward is checked, pressure is brought on the other side ofthe head-blocks.

The invention consists in the construction and novel combination andarrangements ofl view of a sawmill-carriage constructed in accordancewith this invention. ,-Fig. 2 is a plan view of my improvements, theknees, the setup mechanism for the same, and the set-works beingremoved. Fig. 3 is a transverse sectional view on line 3 3 ofFig. 2.Fig. 4 is a similar View yon line 4 4 of-Fig. 2. Fig. 5 is a detailvertical sectional view'on line 5 5 of Fig. 4, illustrating the mannerof supporting the'inner end of the auxiliary support. Fig. 6 is a detailsectional View on line 6 6 of Fig. 3, illustrating the construction ofthe eccentric bushing for adj ustin gthe set-shaft. Figs. 7 and 8 areenlarged detail sectional views of the inner and outer ends of thehead-blocks, illustrating the manner of mounting theantifrict-ion-rolls. Fig. 9 is a transverse sectional view of one of thehead-blocks, illustrating the construction of the chairs and showing thearrangement of thevertical and horizonltal antifriction-rolls. Fig. 10is a horizontal sectional view of thesame.

` Like numerals of reference designate lcorresponding parts in all thefigures of the draw- 1ngs.' Y

l l designatel longitudinal Vbars of a sawmill-carriage frame 2,provided at their upper Ifaces with front and rear chairs 3 and 4,forming waysfor head-blocks 5, which are disposed transversely of thesawmill-carriage frame 2, andv which are designed to be ar ranged at theends of the same in the usual manner, as illustrated in Figs. l and 2ofthe accompanying drawings. The head-blocks are provided at oppositesides with front and l rear flanges 6 and 7, which are arranged in theways or recesses of the chairs 3 and 4, and the latter are constructedsubstantially ythe same, each consisting of a plate provided upper facesof the head-block flanges, and cap-plates 9, detachably secured to theupper faces of the flanges 8 and extending inward over the flanges ofthe head-blocks to retain the latter in the ways of the chairs.

HoriZontally-disposed antifriction-rolls 10 are interposed between thehead-block and the bottoms of the chairs to render the offsetting andonsetting movement frictionless, and therolls 10 are preferably arrangedin recesses 11 and 12 at the front and rear of the head-blocks, thefront recess 11 being longer than the rear recess 12 and receiving agreater number of rolls than, the rear recess, as there is greaterpressure directly beneath a log than at the back of the sawmillcarriage.The recesses 11 and 12 are slightly longer than the series of rolls, aselearlyillustratedin Figs. 7 and 8 of the accompanying drawings, tofacilitate a free movement of the head-blocks, and, with the exceptionof the difference in the number of the rolls 10, the front and rearchairs are the same. In order to render the bearing seats or recesses 11and 12 of the antifriction-rolls dust-proof, strips 13 are employed andare loosely arranged in recesses 14, which extend transversely of thehead-blocks entirely across the bottom flanges thereof. These strips 13,which form a dustguard, rest loosely upon the bottom of the chairs andexclude the fine dust from the bearings.

lVhile the antifriction-rolls serve to render the offsetting andonsetting movements easy and frictionless, the utility of these rolls isgreatly increased by the use of the strips 13 or equivalent dust-guardsarranged beyond the ends of the bearing seats or recesses, as it is wellunderstood that in the operation of a sawmill-carriage a cloud of finedust envelops the lower portions of the carriage and would very quicklypenetrate to and clog up the bearings unless provision were made toeffectually exclude the same. Therefore an important feature of theantifriction-bearings for the slidinghead-blocks is the arrangement ofthe dust-guards.

It has been explained that the length of the roll-recesses is greaterthan the combined diameters of the rolls placed therein to facilitate afree movement of the rolls; but an essentia-l feature with respect tothe length of the roll-recesses is that such recesses be of a lengthless than the throw of the head-blocks, and in the practicalconstruction of the machine the length of the recesses is one-half thethrow of the head-blocks. B y reason of having the roll-recesses of agreater length than the combined diameter of the rolls and also of aless length than the throw of the head-blocks the rolls are not onlypermitted to have a free movement, but are also maintained in aperfectly straight position crosswise of the head-blocks and parallelwith the carriage. In this connection it will be observed that at thelimit of each movement the rolls will be carried against the shouldersformed at the ends of the recesses and any angularity thereof therebycorrected. rlhis is quite importantin order that the rolls shall alwaysremain in proper working positions.

The backward or offsetting movement is made at a time when the forwardmovement of the carriage is stopped and a rapid movement of about twothousand feet per minute is made backward for another cut. rlheheadblocks and the set-works, together with a log resting on thehead-blocks, are heavy, and the result is that a heavy pressure isbrought on the edge of the forward flanges 6 and 7, and when the rapidbackward movement is checked the pressure is brought on the flanges atthe other side of the head-blocks. This heavy pressure causes thehead-blocks to bind and requires a strong pull to offset and onset thehead-blocks. In order to relieve the headblocks of this pressure andprevent them from binding against the vertical flanges S of the chairs,the latter are provided at the inner side edges of the vertical flanges8 with recesses 15, in which are arrangedverticallydisposedantifriction-rolls1G. Theverticallydisposedantifriction-rolls 1G bear against theedges of the flanges Gand 7andcombine with the antifriction-rolls 10 to reduce the friction incidentto offsetting and onsetting the head-blocks to a minimum. The recesses15 are constructed similar to the recesses 11 and 12, and each recess isof greater length than the combined diameters of the rolls placedtherein to permit a free movement of the rolls from one end of therecess to the other and facilitate a free movement of the headblocks.The cap-plates 9 cover the upper ends of the vertical rolls 16 and serveto excludedust from the recesses 15.

The rear chairs' 4 are provided with dcpending flanges 17, arranged onthe outer face of the rear longitudinal beam and provided withlaterally-projecting arms 18, which form bearings for thelongitudinally-disposed offset-shaft 19. The offset-shaft, which isoperated by a hand-lever 20, carries cams 2l, located between andadapted to engage depending projections or brackets 22 and 23 of' thehead-blocks. The cam 2l, which is heartshaped, has one end tapering to apoint, and its other end is enlarged and curved, as shown to form a pairof oppositely-disposed lobes 211. Itis adapted to engagethe outerbracket or projection 23 to offset the head-blocks and move the samebackward from a saw to prevent a log from coming in contact with thelatter in gigging back and injurying the same o1' the lumber, as will bereadily understood by those skilled in the art to which this inventionappertains, and the cam 21 engages the inner bracket or projection 22 toonset the head-block.

Vhile the cams 21 have been described as being of a heart shape, it willbe observed that the essential feature in the construction IOS IIO

of these cams is to provide the same with opposite curvedbearing-surfaces located at opposite sides of the vertical center of thecams and converging in a downward direction. These opposite curvedsurfaces of the heartshaped cams have been referred to as forming thelobes 2l", and by reason of having the particular form described thecams are of exactly the same shape on both sides of the offset-shaft andoccupy the same space at all times. A distinct advantage to note inconnection with the cams 2l is that such cams provide for a much morerapid adjustment or movement of the head-blocks than is pos'- sible bythe use of ordinary eccentrics,'while at the same time requiring lessturn than an eccentric, and consequently a less throw or movement of thehand-lever 20, which is a very important feature in sawmill-carriageswhere theadjusting-lever of the osetting and onsetting shaft is beingconstantly manipulated by the operator.

The inner bracket or projection 22, which is preferably formed integralwith the headblock, is provided at its inner side with ahorizontally-disposed threaded socket 25, receiving an adjustablestop-'screw 26 to limit the movement of the head-block. f

The outer bracket 23, which is slidingly mounted on the lower face ofthe rear end of the head-block, is provided with an upwardlyextendingarm or projection 27, arranged in a longitudinal slot of the head-blockand engaged by an adjusting-screw 28, which is adapted to advance theouter bracket 23 toward the cam to take up the wear and prevent any lostmotion. The bolts 29, which connect .the outer bracket 23 to theheadblock, are arranged in slots of the former, and the screw 28 ismounted in a threaded opening of an arm 30 of the same. The arm 30projects upward from a horizontal extension of the bottom of thehead-block.l The cam is adaptedto be readily lifted out of the recess orspace between the depending pro.- jections or brackets withoutdisturbing the latter, and owing to its particular form it will last fora long time without any material wear and gives the necessary throw tothe head-block with a slight movement of the operating-lever 20.

The head-blocks 5 carry knees 3l,construct ed in the ordinary manner,and which are provided withsuitable -set-up mechanism to enable them tobeadj usted separately with relation to the head-blocks on which theyare mounted in order that they may conform to any irregularity in or thenatural taper of a log. The knees are also provided with any suitabledogging mechanism.

In order to support the set-shaft 32 at a point between the head-blocksand render the reciprocation of a set-up mechanism 33 positive andmaintain theset-shaft in proper position relative t o the head-blocks,an auxiliary support 34 is employed and is slidingly mounted in a chair35. The chair 35, which has a way for the auxiliary supportA similar tothe ways of the front and rear chairs 3 and 4, is provided withcap-plates 36, which retain the auxiliary support in the chair. Anantifriction-roll 37 is interposed between the auxiliary su pport andthe'chair 35 and is arranged in the recess of the former. The auxiliarysupport extends in advance and in rear of the rear beam 1 of thesawmill-carriage, and it preferably terminates short ofl the center ofthe sawmill-carriage, as clearly illustrated in Fig. 4 of theaccompanying drawings, in order to arrange it entirely out of the way oflogs and to prevent any knots of the same coming in contact with it. Theinner portion of the auxiliary support is provided with a rectangularbend or depression 38 and has a longitudinal rib or flange 39 on thelower face thereof. The lower face of the rear of the flange is providedwith a longitudinal groove to receive the antifriction roller or wheel40,

anda bearing 4l for the set-shaft 32 is adjustably mounted in therectangular bend or depression 38. The antifriction roller or wheel 40is journaled in vertically-adjustable bearing-boxes 42, mounted inrecesses of ahorizontal bar 43, which extends across the sawmillcarriageand is bolted or otherwise secured toscrews 26 and 28 are provided withjam-nuts,`

which lock them at the desired adjustment.

rThe bearing-4l, which may be of any suitable construction, is adjustedtransversely of' IOO los

the sawmill-carriage frame by oppositely-disposed horizontaladjusting-screws 45, inter. posed between the opposite sides of thebearing 4l and the sides of the bend or depression 38, mounted insuitable threaded openings of the latter and provided with jam-nuts. Thevertical adjustment of the. bearing 4l is obtained by means of a block46, upon which the bearing 41 is mounted, and the block is adapted to bevaried in thickness in order to position properly the bearing 4l, andthe latter is secured to the auxiliary support by means of verticalbolts 47 passing through it, the block 46, and the support and havingtheir heads arranged in recesses of the iange or rib 39.

An important feature to note in connection with the auxiliary support 34for the set-shaft is that the front or inner end of this supportterminates short of the front beam of the carriage, so as to be arrangedentirely out of the wayof the logs and to leave an open space betweenthe opposite head-blocks. Otherwise, if the auxiliary support extendedentirely across the sawmill-carriage on the upper side of the side beaml the log would have three points of bearing on the carriage-r namely,on the two head-blocks and the auxiliary support. This would be veryobjec- IIO tionable, as the login most cases,- on account of knots andnnevennesses, would not rest steady on the carriage; but theparticulararrangement of the auxiliary support 34 obviatcs thisobjection. While the present invention contemplates the use of anauxiliary support arranged in the manner above specified, yet it isnecessary to brace the front or inner end of the support, which isaccomplished in the present case by the use of the brace-bar 43.However, the essential feature of the auxiliary support and the bracingthereof may be stated to be to arrange the auxiliary support on theupperside of the rear side beam 1 of the carriage-frame and to have abrace connection extended from the front or inner end of the support tothe under side of the opposite or front side beam 1 of the carriage.This feature is also disclosed in a modification of the auxiliarysupport embodied in a concurrently-pending application filedby meDecember-31, 1897, Serial No. 665,152, and patented May),1S9f),No.624,554.

The outer portion of the auxiliary support is provided with dependingprojections or brackets 48 and 49,arranged similaito the projections orbrackets 22 and 23 and located at the inner and outer sides of a cam21', which is substantially heart-shaped, similar to the cams 21. Theinner bracket or projection 4S is preferably formed integral with theauxiliary support, and the ont-er projection or bracket 49 is adjustablyconnected with the support by means of bolts passing through the partsand arranged in suitable slots of the bracket or projection 49 to enablethe latter to be adj usted to take up the wear and prevent any lostmotion. lThe chair 35 of the auxiliary support is provided with alongitudinal extension 50, consisting of a plate and provided at itsends with ways 51, receiving the sliding plate 52, which coperate withthe setshaft 32 in supporting the set-works 33, as illustrated in Fig. 1of the accompanying drawings. The set-works are of the ordinaryconstruction, and a detail description thereof is unnecessary. It willbe seen that the auxiliary support is moved transversely of thesawmill-carriage simultaneously with the main head-block and theset-works are simultaneously reciprocated,and the set-shaft is firmlysupported and is maintained at all times in proper position relative tothe headblocks to prevent anyliability of the lumber varying inthickness.

In applying these improvements to sawmillcarriages and set-works ofdifferent constructions it is necessary to adjust the set-works so thatthe pinions which are carried by lthe same and which vary in diameterwith different manufacturers may be made to mesh accurately with theracks of the head-blocks, and to accomplish this result eccentricbushings 53 are employed. The eccentric bushings 53 consist ofcylindrical sleeves arranged in circular bearing-openings of theheadblocks and provided with eccentric bearingopenings for the receptionof the set-shaft, and a substantially segmental attachmentiiange 54 isformed integral with the cylindrical portion or sleeve of the eccentricbushing and is provided with a series of perforations adapted to receivea bolt 55 to secure the eccentric bushing at the desired adjustment. Theopenings of the head-blocks for the eccentric bushings are preferablyfive inches in diameter at both sides, being a little larger than thelargest pinion employed on set-shafts, and the eccentric bushings, whichaccurately iit in the openings of the headblocks, are adapted to bemounted on either side thereof to make the head-block either right orleft hand, but are preferably mounted at the inner sides of thehead-blocks, as shown in the drawings. The length of the bushing is suchthat only one is required for each head-block, and in assembling theparts the bushings are placed on the shaft with the attachment-dangesinward, as illustrated in Figs. 1 and 2 of the accompanying drawings.The shaft is then placed in the openings of the headblocks,and thelatter are then mountcd in the chairs. The pinions (not shown) are keyedto the shaft and pass through the openings of the head-blocks, and theeccentric bushings are then rotated until the pinions mesh properly withthe racks. The pinions and racks for communicating motion from theset-shaft to the knees are not shown, and as this construction is wellknown in the art illustration thereof is unnecessary. Theeccentrically-arranged bearing-opening of the bushing is preferablylocated about one-quarter of an inch out of center, which gives anadjustment of one-half an inch vertically and horizontally, and thisadjustment is ample for the adjustment of the pinions.

The feature of providing the head-blocks with circular openings of agreater diameter than the diameter of the ordinary sizes ofknee-adjusting pinions to permit of the latter being passed therethroughis of especial importance in connection with head blocks which are madein one piece, and the present invention preferably.contemplates the useof head-blocks of this character as distinguished from head-blocks whichare made of two members or bars. In sawmill-carriages having head-blocksmade of two members or bars access can only be gained to theknee-adjusting pinions when assembling and taking apart the machine byseparating said members or bars; but in the present invention, where thehead-blocks are made of one piece, this cannotbe done,and therefore thespecial utility of the large-size openings in connection with theeccentric bushings will be apparent. A further advantage of theconstruction referred to is that by arranging the eccentric bushings 53at the inner sides of the head-blocks these bushings may be slid back onthe said shaft and the knee-ad j ustin g pinions removed through theopenings at the outer sides of the head-blocks by means of a driftwithout IOC IIC

IIS

disturbing the position of the head-blocks in their supportingchairs.The manner of placing the knee-adjusting pinions within the head-blockshas already been referred to, and it will therefore be 'understood thatthe construction just described greatly facilitates the assembling andtaking apart of the machine.

It will be seen that the manner of mounting the head-blocks reducesfriction incident to odsetting and onsetting to a minimum and preventsthe pressure resulting from the end thrust of a log and the weight ofthe headblocks and the operating mechanism interferin g with theoffsetting and onsetting movement of the head-blocks, that the set-worksand the set shaft are supported and are caused to reciprocate positivelywith the headblocks to preserve the set-shaft in proper position at alltimes relative to the head-blocks,

and thereby prevent any vvariation in the thickness of the lumberincident to the springing of the set-shaft or the supports of thesetworks, and that simple and efficient means are provided for enablingthe set-shaft to be adjusted, so that its pinions will mesh accuratelywith the racks of the knees.

Changes in the form, proportion, and minor details of construction maybe -resorted to without departing from the principle or sacricing any ofthe advantages of the invention.

What I claim isM l. In a sawmill-carriage, the combination of asawmill-carriage frame, a head-block slidingly mounted thereon, a pairof depending brackets or projections mounted on the headblock at one endthereof, located outside of the frame and forming a cam-receiving recessbetween them, one of the brackets or projections being adjustable totake up the wear, an offset shaft located outside of the sawmillcarriageframe, and a cam mounted on the offset shaft and partially fitting inthe said cam-receiving recess and engaging the brackets or projectionsbut having no positive connection therewith, whereby it is adapted to bereadily removed from the recess without detaching the brackets orprojections, substantially as described.

2. In a sawmill-carriage, the combination of a sawmill-carriage frame, ahead-block slidingly mounted thereon and provided at one end with alongitudinal slot, the brackets depending from the head-block at one endthereof and located outside of the frame, one of the brackets beingadjustable to take up the wear, and provided with an upwardlyeX- tendingarm arranged in theslot of the headblock and projecting upwardtherefrom, an adjusting-screw mounted on the head-block and engagingsaid arm, an offset shaft, and a cam mounted on the offset shaft andarranged between and contacting with the brackets but having lnopositive connection therewith,

whereby it is adapted to be readily liftedout4 of thev recess or spacebetween the same, substantially as described.

tacting at its edges wit-h the brackets or provjections, but having nopositive connection therewith, whereby it is adapted to be readilyremovable without detachng the brackets or projections, substantially asset forth.

4E. In a sawmill-carriage, the combination of a sawmill-carriage frame,a head-block slidingly mounted thereon and capable of movementtransversely thereof to offset and onset' a log, and looseantifriction-rolls interposed between the head-block andthesawmill-carriage frame, one of the parts being recessed to receive therollsthe length of the recess being greater than the combined.vdiameters of the rolls placed therein to permit a free movement of thesaid rolls from one end of the recess to the other, said recess beingalso of a length less than the throw of the headblocks, substantially asand for the purpose described.-

IOO

5. In a sawmill-carriage, the combination l of a sawmill-carriage frame,chairs mounted thereon, a head-block slidingly arranged in the chairs,and the vertical and the horizontal antifriction-rolls interposedbetween the head-block and the chairs and supporting the former, thehead-block or the chairs beingrecessed to receive theantifriction-rolls, .the length of each recess being greater than thevcombined diameters of the rolls placed therein to permit a freemovement of the rol ls from one end of the recess to the other, saidrecess being also of a length less than the throw of the head-blocks,substantial'l y as and for the purpose described.

6. In a sawmill-carriage, the combination of a sawmill-carriage frame, asliding headrblock mounted thereon and provided at its lowery face withtransverse grooves, horizontal antifriction-rolls supporting theheadblocks, and the strips disposed transversely of the head-block,loosely arranged in the grooves thereof and forming dustguards,substantially as described.

7. In a sawmill-carriage, the combination of a sawmill-carriage frame, achair provided at opposite sides with vertical ianges having recesses, ahead-block arranged in thechair, and provided at its lower face with arecess, cap-plates mounted on the vertical flanges of the chairs andengaging the head-block, and the vertical and horizontal'antifriction-rolls located in the recesses of the head-block and thechair, each recess being of greater length IIO than the combineddiameters of the rolls placed therein, substantially as and for thepurpose described.

S. In a sawmill-carriage, the combination of a sawmill-carriage frame,sliding headblocks mounted thereon and provided with bearings, aset-shaft journaled in said bearings, an auxiliary support for theset-shaft disposed transversely of the sawmill-carriage frame andlocated at a point between the head-blocks and extending from one sideof the frame to the set-shaft, said support being slidingly mounted onthe frame,and means for reciprocating the head-blocks and the supportsimultaneously, substantially as described.

El. In a sawmill-carriage, the combination of a sawmill-carriage frame,sliding headblocks provided with bearings, a set-shaft journaled in thebearings, a sliding auxiliary support for the set-shaft located betweenthe head-blocks, a sliding plate mounted on the sawmill-carriage frameadjacent to the auxiliarysupport, and set-works mounted on the set-shaftand the sliding plate, substantially as described.

10. In a sawmill-carriage, the combination of a sawmill-carriage frame,head-blocks mounted thereon and adapted to slide trans- Yersely thereof,a sliding auxiliary support mounted on the saw mill-carriage frame atthe rear side thereof and terminating short of the other side, aset-shaft journaled on the headblocks and the auxiliary support,projections or brackets depending from the head-blocks and the support,an oifset shaft, and cams carried by the offset shafts and locatedbetween the depending brackets or projections and adapted to offsetandonset the headblocks and the support simultaneously, substantially asdescribed.

11. In a sawmill-carriage, the combination of a sawmillcarriage frame,head-blocks mounted thereon and capable of movement transverselythereof, a chair mounted on the sawmill-carriage frame and provided withan extension having ways, a sliding plate mounted in the ways, a slidingauxiliary support arranged in said chair, an adjustable bearing mountedon the inner portion of the auxiliary support and capable of verticaland horizontal movement-,a set-shaft journaled in the said bearing andon the main head-blocks, setworks mounted on the sliding plate and onthe set-shaft, and an antifriction roller or wheel supporting the innerend of the auxiliary support, substantially as described.

12. In a sawmill-carriage, the combination of a sawmill-carriage frame,a bar disposed transversely of the sawmill-carriage frame,anantifriction roller or wheel journaled on the bar, an auxiliary supportmounted on the rea-r side of the sawmill-carriage frame, terminatingshort of the front side thereof and supported at its inner end by theantifriction roller or wheel, a set-shaft bearing arranged at the innerend of the auxiliarysupport, and means forrociprocating the lattersimultaneously with the head-blocks of the sawmillcarriage,substantially as described.

123. In a sawmill-carriage, the combination of a sawmill-carriage frame,the transverse bar 43 secured thereto, provided with recesses and havingthreaded openings beneath the same, adjusting screws mounted in thethreaded openings, vertically-movable journal-boxes mounted in therecesses of the bearing 43,and supported by the adj Listing-screws, anantifriction roller or wheel journaled in said boxes, a slidingauxiliary support mounted on the rear side of the sawmill-carriageframe, terminatingshort of the front side and provided at its inner endwitha longitudinal rib arranged on the antifriction roller or wheel,said auxiliary support having a set-shaft bearing, and means forreciprocating the auxiliary support simultanously with the head-blocksof the sawmill-carriage, substantially as described.

1-1. In a sawmill-carriage, the combination of a sawmill-carriage frame,aset-sh aft, a sliding auxiliary support, an adjustable set-shaf tbearing mounted on the auxiliary support, a block interposed between thebearing and the auxiliary support, and adjusting-screws mounted on theauxiliary support and engaging with a bearing at opposite sides thereof,and means forreciprocatin g the auxiliary support simultaneously withthe head-blocks of the sawmillcarriage, substantially as described.

15. In a sawmill-carriage, the combination of a sawmill-carriage frame,a bar disposed transversely of the sawmill-carriage frame and providedat a point between the sides thereof with an adjustable bearing, anauxiliary set-shaft support slidingly mounted on one side of thesawmill-carriage frame and extending inward therefrom to the adjustablebearing of the transverse bar and supported by the same, said auxiliarysupport being provided with a set-shaft bearing, and means forreciprocating the auxiliary support simultaneously with the head-blocksof the sawmill-carriage, substantially as described.

16. In a sawmill-carriage, the combination of a sawmill-carriage frame,a head-block slidingly mounted on the sawmill carriage frame and thevertical and horizontal antifriction-rolls interposed between theheadblocks and the sawmill-carriage frame and arranged in suitablerecesses, each recess being of greater length than the combineddiameters of the rolls, and each recess heilig also of a length lessthan the throw of the head-blocks, substantially as and for the purposedescribed.

17. In a sawmill-carriage, the combination of a sawmill-carriage frame,sliding headblocks mounted thereon and provided with bearings, aset-shaft journaled in said bearings, an auxiliary support disposedtransversely of the sawmill-carriage frame and extending from one sidethereof to the set-shaft and terminating at the latter, said auxiliaryIIO IZO

support being provided with a bearin g receiving the set-shaft, a lowerbearing-bar extending across and mounted on the sawmill-carriage frameand sustaining the under side of the auxiliary support, and means forreciprocating the head-blocks and the auxiliary support simultaneously,substantially as and for the purpose described.

18. In a sawmillcarriage, the carriageframe, a head-block` slidablymounted on the frame, a pair of pendent brackets or projectionsprojected from the head-block at one end thereof, an offset'shaftlocated outside of the sawmillcarriage frame, and a cam mounted on theoffset shaft and partially fitting in the recess formed between saidbrackets or projections, said cam contacting at its edges with thebrackets or projections but having no positive connection therewith,whereby it is adapted to be readily removed without detachin g thebrackets or projections, substantially as setforth.

19. In a sawmillcarriage, the carriageframe, ahead-block slidablymounted on the frame, a pair of spaced vertically-disposed brackets orprojections depending from the underside of the head-block at one endthereof, an adjustable stop projection carried by the head-block belowits under side and arranged to engage one of the carriage-frame beamsto' limit the movement of the headblock, an offset shaft arrangedlongitudinally and outside of the frame beneath the headblock, anda cammounted on said shaft and lying in the space between said brackets orprojections, substantially as specified.

20. In a sawmill-carriage, the combination of the carriage-frame, ahead-block slidably mounted on the frame, loose antifriction-rollsinterposed between the head-block and the frame-beams, one of the partsbeing recessed to receive the rolls, and d ust-guards extending acrossthe space between the head-block and the frame-beams beyond the endsofthe recesses for the groups of rolls, substantially as described.

21. In a sawmillcarriage, the carriageframe, the head-block slidablymounted on the frame, loose antifriction-rolls interposed between thehead-block and the frame-beams, one of the parts being recessed toreceive the rolls, and dust-guard strips loosely arranged in the spacebetween the head-block and the frame-beams beyond the ends of therecesses for the rolls, substantially as set forth.

22. In a sawmillcarriage, the carriageframe, head-blocks slidablymounted on the frame and provided with bearings, a set-shaft journaledin said bearings, an auxiliary support for the set-shaft located at apoint between the head-blocks, said au xiliary support being arranged toslide on the upper side of the rear side beam of the carriage-frame andhaving a brace for its front or inner end eX- tending beneath the frontside beam of the carriage-frame, and means for reciprocating thehead-blocks and the lauxiliary support simultaneously, substantially asset forth.

23. In a sawmillcarriage, the carriageframe, a head-block slidablymounted on the frame and havinga pair ofvertically-disposed pendentbrackets or projections at one end thereof, an offset shaft arrangedoutside of the frame. and longitudinally thereof, and a cani mounted onsaid shaft and arranged between said brackets or projections, said cambeing provided at opposite sides of its Vertical center with curvedbearing surfaces which converge in a downwardvdirection and make the camof a uniformal tapering width, substantially as set forth.

24. In a sawmillcarriage, the carriageframe, a head-block slidablymounted on the frame and havinga pair of vertically-disposed pendentbrackets or projections at one end, an oiset shaft arranged outside ofthe frame and longitudinally thereof, and a cam mounted on said shaftand filling the space between the brackets or'projections, but having nopositive connection therewith, said cam being provided at opposite sidesof the .vertical center with downwardly-convergent surfaces of equalcurvature, thereby making the cam of a uniformal tapering form with itsgreatest width above the plane of the offset shaft, substantially as setforth.

25. In a -sawmillcarriage, the carriageframe, head-blocks slidablymounted on the frame and provided in their inner and outer sides withcircular openings of a greater diameter than the diameter of ordinarysizes of knee-adjusting pinions, to permit of the latter being passedtherethrough, a set-shaft within the frame, an auxiliary support for theset-shaft located at a point between the head -blocks and movabletherewith, eccentric bushings tted within theopenings at the inner sidesof the head-blocks and forming bearingsfor the set-shaft, and means forfastening the bushings to the head-blocks in their adjusted positions,substantially as set forth.

1n testimony that I claim the foregoing as my own I have hereto affixedmy signature in the presence of two witnesses.

NOAH SHAW.`

Witnesses:

WILLIAM H. ALLEN, J. D. HILLS.

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